Lamp



FIG. 1 is a perspective view of my design for a lamp;

FIG. 2 is an end elevational view of my design for a lamp, showing the top and bottom portion.

FIG. 3 is a side elevational view of my design for a lamp, showing the top and bottom portion;

FIG. 4 is a plan view of the bottom portion of my design for a lamp shown in the direction IV in FIG. 3; and,

FIG. 5 is a plan view of the bottom portion of my design for a lamp shown in the direction V in FIG. 3. 

The ornamental design for a lamp, as shown and described. 